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Yes, they exist! How they are going to work? I am going to try to explain now.  Very likely you remember I mentioned that the course has 2 hours of preparation and 2 hours of post-lecture homework. You have to earn you credits. So I am giving homework to deliver and I am making you learn other things to even being able to download the data or submit your homework. Say I am pushing your limits to make you learn Latex, Git, R, etc. on your ``free'' time time.